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teardown.go
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teardown.go
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// SPDX-FileCopyrightText: 2023 Steffen Vogel <post@steffenvogel.de>
// SPDX-License-Identifier: Apache-2.0
package gont
import (
"errors"
"fmt"
"math/rand"
"os"
"path"
"path/filepath"
"sort"
"github.com/stv0g/gont/v2/internal/utils"
"github.com/vishvananda/netns"
"golang.org/x/sys/unix"
)
func NetworkNames() []string {
names := []string{}
nets, err := os.ReadDir(baseVarDir)
if err != nil {
return names
}
for _, net := range nets {
if net.IsDir() {
names = append(names, net.Name())
}
}
sort.Strings(names)
return names
}
func NodeNames(network string) []string {
names := []string{}
nodesDir := path.Join(baseVarDir, network, "nodes")
nets, err := os.ReadDir(nodesDir)
if err != nil {
return names
}
for _, net := range nets {
if net.IsDir() {
names = append(names, net.Name())
}
}
sort.Strings(names)
return names
}
func GenerateNetworkName() string {
existing := NetworkNames()
for i := 0; i < 32; i++ {
random := GetRandomName()
index := sort.SearchStrings(existing, random)
if index >= len(existing) || existing[index] != random {
return random
}
}
// TODO: This can generate non-unique network names!
index := rand.Intn(len(Names)) //nolint:gosec
random := Names[index]
return fmt.Sprintf("%s%d", random, rand.Intn(128)+1) //nolint:gosec
}
func TeardownAllNetworks() error {
for _, name := range NetworkNames() {
if err := TeardownNetwork(name); err != nil {
return fmt.Errorf("failed to teardown network '%s': %w", name, err)
}
}
return nil
}
func TeardownNetwork(network string) error {
networkVarPath := filepath.Join(baseVarDir, network)
networkTmpPath := filepath.Join(baseTmpDir, network)
nodesVarPath := filepath.Join(networkVarPath, "nodes")
fis, err := os.ReadDir(nodesVarPath)
if err != nil {
return fmt.Errorf("failed to read nodes dir: %w", err)
}
for _, fi := range fis {
if !fi.IsDir() {
continue
}
node := fi.Name()
if err := TeardownNode(network, node); err != nil {
return fmt.Errorf("failed to teardown node '%s': %w", node, err)
}
}
if err := os.RemoveAll(networkVarPath); err != nil {
return fmt.Errorf("failed to delete network dir: %w", err)
}
if err := os.RemoveAll(networkTmpPath); err != nil {
return fmt.Errorf("failed to delete network dir: %w", err)
}
return nil
}
func TeardownNode(network, node string) error {
nodePath := filepath.Join(baseVarDir, network, "nodes", node)
nsMount := filepath.Join(nodePath, "ns", "net")
netNsName := fmt.Sprintf("gont-%s-%s", network, node)
if mounted, err := utils.IsMountPoint(nsMount); err == nil && mounted {
if err := unix.Unmount(nsMount, 0); err != nil {
return fmt.Errorf("failed to unmount netns of node '%s': %w", node, err)
}
} else if err != nil && !errors.Is(err, unix.ENOENT) {
return fmt.Errorf("failed to check if mounted: %w", err)
}
if err := netns.DeleteNamed(netNsName); err != nil && !errors.Is(err, unix.ENOENT) {
return fmt.Errorf("failed to delete named network namespace: %w", err)
}
if err := os.RemoveAll(nodePath); err != nil {
return fmt.Errorf("failed to delete node dir: %w", err)
}
return nil
}